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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad5148e263b640861677e203ddd22cf11bc7baea02d1b45de26952d1d059b2d' 
  AND token = 'maWZf6zVqOmKrS1axZWq5wilFw3IEhd9o5VWMBis8EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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