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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a799afa80643d541bd6caee32a88ee4960de0e582fc3ecbb41870f1505800528' 
  AND token = 'axtEK5c2uHf5EWSwYZURMsKD+ze/2SMhBj19B8XRVfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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