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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e178f04a01c9e7c5e0bc85832b2193f2ae88daa66d6c776e66adf7f3f090f8' 
  AND token = '3FzmcX/ew/2XRkVcjlfRJsTZH3d1Q5FHDuzl3o4yTo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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