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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ebdd1953339ca661200ed4ac274a00bd8e6c3c4d1ae17b33d0bfe1e3f671cc' 
  AND token = 'd3PoK/yZoHCKyZZ6ttKrobnkQb7p/9WXQj24PxresRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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