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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0681c5fc90c4c9218304789cdd7093bdab340bd99b144b63bcbf7b49f63e16' 
  AND token = 'E1u8xM2+JONv4sO1Qcxu7F1vVpsU4D8VF2qxYFiX0Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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