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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9f68f11ceb6ea87af699c057a9125e1f11252d12690df1189d2358bccd1eeb' 
  AND token = '0X9mHSbyW858lnkKKadYHN48lbH5ep9ccNavwiljSXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}