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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db83491290b1e1ef4d97052c83d40b43eebf30a834e1596cfd2c9e3dc0342d0' 
  AND token = '4SAdUvP+PSVqVBJKnY2a2jNJL6A29fR7ZG3v1E8+J+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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