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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47fdabad3e0b89dae61acb2acbce2787665efb75aea6a84cf92a21e9fc1dc0e0' 
  AND token = '3Ir1c+hAlfqKzxRU4BjGLgCY1NThWMuJPre2JWnh85U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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