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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06908d125aca5bde738a27ae9ef7c275d236a94d384209983c8533a4ab1c2ba7' 
  AND token = '/sVa2jOMPzCRfqgmU1MRL3orJyxq3NWa/rM/nlJctiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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