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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08a9eef6610a213ff8eba87dc2888ba0140863c7921f07177cfaceb3ac99b4f' 
  AND token = '/g+dhMgmGD6S+oQT53U8h2IiEscyVEGPyxr+fqlarlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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