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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8c3c1f246a360959f9cf5f4201da7a8dd42ca7dafb6aa26b1638c674adf34f' 
  AND token = 'ZF2U/uaRU9eqnaE7Okp0zvJTuNY5z3F3E3ttmIvy2dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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