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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f92f9a6ae02988685dc5d6480641ee03fc5d0e00ec53da509437b68b74c55e3' 
  AND token = 'BLd4Rwb+JznJx7N7jkrksVDmnRaN2kic5Nyyz+g6jeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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