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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ca3f1e35b00c03b39420e0682ddf2c41ea1760a76b8e304a663cb7804d4982' 
  AND token = 'g1IrqNJJeuQ/IwKb/SU75J5ZlECX8EcNSUaUzfuK5Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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