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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e25d8c8d32f88adba32d31d9eec650ed0841810fc25f9d6f671ab55c0b8537' 
  AND token = '+BGzqo1x49uXgkmWG3uSTZwnqWd8YIoIl3i0OJ8fo6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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