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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6c460d0b4b336bf0f607cd7691d2a1515213289b10e171bf3ef1545f3e1e2c' 
  AND token = '5k14HgccS272wwgk3lbdlL6nflz54VHs+Y98UHqPRGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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