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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86085ea527fa95c62852852d33b5aa113e82a3b578da86e976f962b63b63d5a9' 
  AND token = '1S5qAiYL/edjO3YagJskP3qEOMu4bgmVdJVmRg0liSc=' 
  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"
    }
  }
}