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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb829ef9cec9502a45e3b557543f736a49daf4b385d50b74f8758a8d3242e78' 
  AND token = 'u5TLfHBitMCaVNfwMqdW3+6ZRG3bs6v1VqtE2c8+HNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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