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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e8f891d34e729c1f36bed398a64c62a5cd2430d7306910f0be5704360d702a' 
  AND token = 'xklS52GxP9MpZJ8UE6CgsvzOdcsGyRMIA58y90FttPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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