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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b23d60c0b0c73c0e1e32bab1d1b1486226008d5dc6bb0899d9282ad62e8464' 
  AND token = '5NAmZEG0Fx9g/DXpku4Qsz7u5dDsPHcBZIa4zgqlFxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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