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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e0254f657754e2e2df32862a99939ba2c6e434250175ddcc3c2480d79c9caa' 
  AND token = 'LggddW0/bRyifQJHpiEqnu7frUk/eeijls2vLtKumUo=' 
  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"
    }
  }
}