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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ca45b58be9afc7a0f78366d544cc9ff9dc3a40fa08346e6c6460d2f02fd8f0' 
  AND token = 'OHdb2qcBJ5Vw2uWm3dCyI8zp5Ql0qJmKQLY0bMaFZnk=' 
  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"
    }
  }
}