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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad5fdaa43100bf7d16da4ef5926612974858efa1746d32071e0aff003ea96d4' 
  AND token = 'RcY2UrLx7rYnThZNM5rtqWOcpXRkOr0uiAv1H8IRygg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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