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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5689fe8ec6cab33793b4c14a93c10354f7f20427804e3e0ff0e850e4eb8270e7' 
  AND token = 'o2pGWCrz8zH+2NDU2sKppUcn79D731ScB2SGbBK1Gyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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