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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6406dbdb39b6f49a04bb538ecd400973887cc3c02c63fd61df66799eefcf6d78' 
  AND token = '1SVZM90Q5sHLp5LyoTryAv0bzDM0l3pSt+Vmq3R/6t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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