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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f00fcbaf2a32809058ba557c4dcc1d37481f04e2cea6937967a185bf4f3c3d' 
  AND token = 'lplSN2KGxaeGKI2HD8D2pMASLkEhLB6jCAycC0aNqY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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