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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1e2a57cb3daba771b558aa13a61faac5c64d3e1c9343ea44cd26d9f341d8ff' 
  AND token = 'NWZCVHYzj1Sc7r5Wqef7yuOAQNCJ4IztyWyh8TlN4GE=' 
  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"
    }
  }
}