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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4003ee5e26ae235e33b9799687e7d1277791f1cb1bd914da89c84c907edefe4' 
  AND token = 'muTby1ug44+cIM2Kcd4oeOyIIE9173fEHKvfLWegxCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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