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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61151052755cbf94b244bda9ff945b237bc0b0872a59aeab2b8ebb9b37cd7a9' 
  AND token = '2efsxPuwr3HZnptfFJ+LtIiC1dBgsF2J4V1qp45WExk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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