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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e75b06db73926046cd3f38ec9c9ebddbffef75aad64089633e2f8d1b4ae7e5c' 
  AND token = 'T13TnC/KyEo45X+FxkEspKHZkctj01WkEMcur9MOt9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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