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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5cc275831462c7d192c2e983d8ff09cc4a96ac75a824c510369e006d1c3203' 
  AND token = 'WtW9U+f/TY/2WqBM175cc17qP1aed0Aoz40YA4YYZvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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