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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da614c34d3a12db1efabb7071fae31260a34bc36ba8827ab9f4eb3c9fda3e08b' 
  AND token = 'DWWAi2M/4G2topQUGc3Uz22y+7VuR4pj7+GN/IkQsmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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