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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7089a48dce9c07eb1de852d6ff550859a7dc691ba158cd739ec44abb5a7f79d8' 
  AND token = 'IV2Y/bA9JZJzTp8VVfdVSLDPFJnxb9PQHe+vnIozfoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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