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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29282ef629a3a9a7c332fe787a0ee7cf99f2e10af49b638342aa0947c58eeb33' 
  AND token = 'ggUa6vp1dCP3IOHkJ6eCbf96IaNtzmXrGfjg8ygnd9s=' 
  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"
    }
  }
}