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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2b930f42d458f9c85fc531b5f35f6bbd3cb558270a9e02d8b5351906bfb4e0' 
  AND token = 'OMG04Q5Y4gsG+SXQe7GZ7jrk20XIbG2flV26w4Eqqzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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