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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a284499218e5f5d64436a64e03839af4d59c87f2c228ee4259fb1821a1aba5ab' 
  AND token = 'sETOetuq+pyweRvxRjmP+mMJTCHw5syEjjL4Ms49rSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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