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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44cff7a125cbbe35d40c2373f35dafbf7bd132b9fc09cd07265f7520b0262d26' 
  AND token = 'x3cNh2mOQJrovbZEbhCFk6Iol29xqa9d7UXy/EXTQag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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