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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24a63cfa40983751a383015b19e4181c350c7e0a0068cda9b21633d496d1d3d' 
  AND token = 'JMvvqdLKN9PSh0yH5MVe2SXQoR2JJe8nYbh0hAOsQfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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