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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84ab0ce5dd8611ea77d511251766d36bfabc81b22298ed3d57c9d7963492d1d' 
  AND token = 'w8FezjRocjDWnsa9hKSv01gI2bicI+/sEpLXagNYSf4=' 
  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"
    }
  }
}