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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a003fea370f567eb808a2f69ffc42f947157d9738fffab9851a6e57fdfc3060b' 
  AND token = 'ex7yCjCHZuK9oar9eHs8hD9ops8vY/fH2ptQCzndVN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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