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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab4c48b519c5486f8112c709c9ce774e91ab868e53d34de8511eaff084f817a' 
  AND token = 'izf1idOgFKcwYGErs7eOgTMBFXPMk66e6jHWERdoRx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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