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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6e9ff38a03aedb6ef0e56bb95b7393bfcd9b18887213aaf37ee02e0e502269' 
  AND token = '8oFmBL5QShVMW6QdgIFy1YudKjHMemHgtKFR/nR9Bp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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