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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a94e9579520001a75212b783084b9cda5701b8830b02319d0b2959e483603a' 
  AND token = 'WdSjmMD0GcVBtVtV4btVuJ34SKPpB8bOFwISU2STJ7Q=' 
  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"
    }
  }
}