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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda9ca063770d3761f1c3efcbdd780c2a26cb8d509a4fd95867ae8f64c6b5e2a' 
  AND token = 'M/AruzSDLmYNRFOv4qhutsbPORQ/eAu79WkOLV/0C6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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