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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9586ae8968c25138e50f9374af5cea7ec46c64c2d4e67bf294b762d35b5b3426' 
  AND token = 'rEHp5lBFeIgtpRmBJ3jDniCFig0lyHoUuwHGgntjFoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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